Will starlings nesting above a house martins deter them?

Hello,

I've recently discovered a pair of starlings that have started to build a nest right above the situation of an artificial house martin cup that I put up last year. The house martins found it last summer as there is a colony nearby. They didn't breed there but expressed interest and I was hoping this year they would nest. Will the starlings be unfriendly neighbours and chase them off when they arrive in the coming weeks. If so i might put up another one further away.

Many thanks